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D( i )
9-(11*i) = 0
9-(11*i) = 0
9-(11*i) = 0
9-11*i = 0
9-11*i = 0 // - 9
-11*i = -9 // : -11
i = -9/(-11)
i = 9/11
i in (-oo:9/11) U (9/11:+oo)
1/(9-(11*i)) = 0
1/(9-11*i) = 0
1 = 0
i belongs to the empty set
i belongs to the empty set
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